package com.example.file.utils;

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.http.server.reactive.ServerHttpRequest;

@Slf4j
public class IPUtils {


	/**
	 * 获取IP地址
	 * 使用Nginx等反向代理软件， 则不能通过request.getRemoteAddr()获取IP地址
	 * 如果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-For中第一个非unknown的有效IP字符串，则为真实IP地址
	 */
	public static String getIpAddr(ServerHttpRequest request) {
    	String ip = null;

        try {
            ip = request.getHeaders().getFirst("x-forwarded-for");
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeaders().getFirst("Proxy-Client-IP");
            }
            if (StringUtils.isEmpty(ip) || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeaders().getFirst("WL-Proxy-Client-IP");
            }
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeaders().getFirst("HTTP_CLIENT_IP");
            }
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeaders().getFirst("HTTP_X_FORWARDED_FOR");
            }
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                if(request.getRemoteAddress()!=null){
                    ip=request.getRemoteAddress().getAddress().getHostAddress();
                }

            }
        } catch (Exception e) {
        	log.error("IPUtils ERROR ", e);
        }
        
        //使用代理，则获取第一个IP地址
        if(StringUtils.isNotBlank(ip) && ip.length() > 15) {
			if(ip.indexOf(",") > 0) {
				ip = ip.substring(0, ip.indexOf(","));
			}
		}
        
        return ip;
    }
	
}
